The best date I had was during a Doha-Tokyo flight. The person I had to meet was from Lebanon (we started talking on Skype one month before the departure) and got me a ticket to Tokyo for my birthday to meet me in real life, we spent the most amazing "first date" ever during the flight, and I lived the most meaningful love-story that I could have ever imagined.
Either Six Flags Magic Mountain or City Walk, Hollywood (we went sightseeing, had dinner, went to a bakery, went to a lemonade/juice shop, and saw a movie). Both dates happened with the same person.